Added Snake Game

OneLoneCoder_Snake.cpp

@@ -0,0 +1,180 @@
+/*
+OneLoneCoder.com - Command Line Snake
+"Give me a break, I'm on holiday..." - @Javidx9
+
+Disclaimer
+~~~~~~~~~~
+I don't care what you use this for. It's intended to be educational, and perhaps
+to the oddly minded - a little bit of fun. Please hack this, change it and use it
+in any way you see fit. BUT, you acknowledge that I am not responsible for anything
+bad that happens as a result of your actions. However, if good stuff happens, I
+would appreciate a shout out, or at least give the blog some publicity for me.
+Cheers!
+
+Background
+~~~~~~~~~~
+Classic Snake! Controls are Arrow keys Left & Right, eat food, grow larger, avoid self!
+
+
+Author
+~~~~~~
+Twitter: @javidx9
+Blog: www.onelonecoder.com
+
+Video:
+~~~~~~
+https://youtu.be/e8lYLYlrGLg
+
+Last Updated: 24/06/2017
+*/
+
+#include <iostream>
+#include <list>
+#include <thread>
+using namespace std;
+
+#include <Windows.h>
+
+int nScreenWidth = 120;
+int nScreenHeight = 30;
+
+struct sSnakeSegment
+{
+	int x;
+	int y;
+};
+
+int main()
+{
+	// Create Screen Buffer
+	wchar_t *screen = new wchar_t[nScreenWidth*nScreenHeight];
+	for (int i = 0; i < nScreenWidth*nScreenHeight; i++) screen[i] = L' ';
+	HANDLE hConsole = CreateConsoleScreenBuffer(GENERIC_READ | GENERIC_WRITE, 0, NULL, CONSOLE_TEXTMODE_BUFFER, NULL);
+	SetConsoleActiveScreenBuffer(hConsole);
+	DWORD dwBytesWritten = 0;
+
+	while(1)
+	{
+		// Reset to known state
+		list<sSnakeSegment> snake = { {60,15},{61,15},{62,15},{63,15},{64,15},{65,15},{66,15},{67,15},{68,15},{69,15} };
+		int nFoodX = 30;
+		int nFoodY = 15;
+		int nScore = 0;
+		int nSnakeDirection = 3;
+		bool bDead = false;
+		bool bKeyLeft = false, bKeyRight = false, bKeyLeftOld = false, bKeyRightOld = false;
+
+		while (!bDead)
+		{
+			// Frame Timing, compensate for aspect ratio of command line
+			auto t1 = chrono::system_clock::now();
+			while ((chrono::system_clock::now() - t1) < ((nSnakeDirection % 2 == 1) ? 120ms : 200ms))
+			{
+				// Get Input, 
+				bKeyRight = (0x8000 & GetAsyncKeyState((unsigned char)('\x27'))) != 0;
+				bKeyLeft = (0x8000 & GetAsyncKeyState((unsigned char)('\x25'))) != 0;
+
+				if (bKeyRight && !bKeyRightOld)
+				{
+					nSnakeDirection++;
+					if (nSnakeDirection == 4) nSnakeDirection = 0;
+				}
+
+				if (bKeyLeft && !bKeyLeftOld)
+				{
+					nSnakeDirection--;
+					if (nSnakeDirection == -1) nSnakeDirection = 3;
+				}
+
+				bKeyRightOld = bKeyRight;
+				bKeyLeftOld = bKeyLeft;
+			}
+
+			// ==== Logic
+
+			// Update Snake Position, place a new head at the front of the list in
+			// the right direction
+			switch (nSnakeDirection)
+			{
+			case 0: // UP
+				snake.push_front({ snake.front().x, snake.front().y - 1 });
+				break;
+			case 1: // RIGHT
+				snake.push_front({ snake.front().x + 1, snake.front().y });
+				break;
+			case 2: // DOWN
+				snake.push_front({ snake.front().x, snake.front().y + 1 });
+				break;
+			case 3: // LEFT
+				snake.push_front({ snake.front().x - 1, snake.front().y });
+				break;
+			}
+
+			// Collision Detect Snake V Food
+			if (snake.front().x == nFoodX && snake.front().y == nFoodY)
+			{
+				nScore++;
+				while (screen[nFoodY * nScreenWidth + nFoodX] != L' ')
+				{
+					nFoodX = rand() % nScreenWidth;
+					nFoodY = (rand() % (nScreenHeight-3))+3;
+				}
+
+				for (int i = 0; i < 5; i++)
+					snake.push_back({ snake.back().x, snake.back().y });
+			}
+
+			// Collision Detect Snake V World
+			if (snake.front().x < 0 || snake.front().x >= nScreenWidth)
+				bDead = true;
+			if (snake.front().y < 3 || snake.front().y >= nScreenHeight)
+				bDead = true;
+
+			// Collision Detect Snake V Snake
+			for (list<sSnakeSegment>::iterator i = snake.begin(); i != snake.end(); i++)
+				if (i != snake.begin() && i->x == snake.front().x && i->y == snake.front().y)
+					bDead = true;
+
+			// Chop off Snakes tail :-/
+			snake.pop_back();
+
+			// ==== Presentation
+
+			// Clear Screen
+			for (int i = 0; i < nScreenWidth*nScreenHeight; i++) screen[i] = L' ';
+
+			// Draw Stats & Border
+			for (int i = 0; i < nScreenWidth; i++)
+			{
+				screen[i] = L'=';
+				screen[2 * nScreenWidth + i] = L'=';
+			}
+			wsprintf(&screen[nScreenWidth + 5], L"www.OneLoneCoder.com - S N A K E ! !                SCORE: %d", nScore);
+
+
+			// Draw Snake Body
+			for (auto s : snake)
+				screen[s.y * nScreenWidth + s.x] = bDead ? L'+' : L'O';
+
+			// Draw Snake Head
+			screen[snake.front().y * nScreenWidth + snake.front().x] = bDead ? L'X' : L'@';
+
+			// Draw Food
+			screen[nFoodY * nScreenWidth + nFoodX] = L'%';
+
+			if (bDead)
+				wsprintf(&screen[15 * nScreenWidth + 40], L"    PRESS 'SPACE' TO PLAY AGAIN    ");
+
+			// Display Frame
+			WriteConsoleOutputCharacter(hConsole, screen, nScreenWidth * nScreenHeight, { 0,0 }, &dwBytesWritten);
+		}
+
+		// Wait for space
+		while ((0x8000 & GetAsyncKeyState((unsigned char)('\x20'))) == 0);
+	}
+
+	return 0;
+}
+
+
+